If your GHK injection site gets irritated try this , 1. Dilute it by adding more water to the syringe , 2. Let it sit until it reaches room temperature , Also, make sure youre rotating injection Why is the injection site painful after administering GHK Cu (Glycyl L Histidyl L Lysine Copper) 2mg mixed with normal saline? Subcutaneous injection: Definition and what to expect GHK Cu Troche Strive Pharmacy Mitigating GHK Cu Injection Pain: Tips and Tricks Gabriel Alizaidy, MD, MS posted on the topic LinkedIn The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline